With the game on a knife edge, Popp was first to react inside the box to head home from a cross from the right and spark wild celebrations in the stands.
It means England will have to beat the eight-time winners to claim their first Euros crown at the third time of asking, but buoyed by the home crowd, they may not get a better chance.
And Wiegman, who fielded the same starting line-up for the fifth consecutive game against Sweden, insists she has faith in her favoured team to get the job done against Germany/France.
“We have confidence in this team, our players stay calm and stick with the plan,” the 52-year-old added. “We spoke about scenarios and sometimes things go well and sometimes things don’t. We can count on each other and our task and then come back into the team.”